The document discusses the history and importance of yoga. It notes that yoga originated in ancient India, as evidenced by artifacts from the Indus Valley Civilization dating back to 3300-1300 BC that depicted early yoga practices. The roots of modern yoga are found in ancient scriptures like the Upanishads and writings of sage Patanjali, who documented the eight limbs of yoga. The document outlines the various historical periods of yoga in India and its spread outside India in the modern era. It also discusses the United Nations designation of International Yoga Day on June 21st to celebrate the benefits of yoga for health, harmony, and peace worldwide.